1. __________ cover a large geographical area (region, nation, hemisphere) where
public right of way is often required. While many of these networks are made up of
privately owned transmission facilities, they usually also include common carrierbased resources.
a. WAN
b. MAN
c. LAN
2. __________ occurs when the network is unable to connect two stations because of
the unavailability of transmission resources between them.
a. non-blocking
b. congested
c. blocking
3. In a __________ network, all stations are permitted to be connected (in part) at once
and grants all possible connection requests as long as the called party is not busy.
a. non-blocking
b. blocking
c. congested
4. In __________ routing, all possible routes between two end offices are predefined.
a. hierarchical
b. direct
c. alternate
5. __________ signals are the means by which the network is managed and means for
establishing, maintaining and terminating calls.
a. control
b. error correction
c. supervisory
6. In __________ signaling, the same channel is used to carry control signals as well as
the call; the signaling starts from the source the call originates and follows the same
path as the call.
a. common channel
b. out of band
c. in-channel
7. __________ switching is a method of transmitting messages through a
communications network, in which long messages are subdivided into short packets.
a. circuit
b. packet
c. fast packet
8. In packet switching the __________ method is used to establish a logical connection
between two stations.
a. virtual circuit
b. datagram
c. connectionless
9. In packet switching, the __________ method is used to route independent, selfcontained that carry information sufficient for routing.
a. datagram
b. virtual circuit
c. X.25
10. __________ is an ITU-T standard that specifies an interface between a host computer
system and a packet switching network.
a. PDN
b. virtual circuit
c. X.25
11. __________ is a telecommunication service that uses digital transmission and
switching technology to support voice and digital data communications.
a. ATM
b. ISDN
c. SONET
12. The physical link between the subscriber and the ISDN central office is generally
referred to as the __________ or __________ loop.
a. private or local
b. enterprise or local
c. subscriber or local
13. A ___________ network is a packet switched network that is publically available to
subscribers.
a. PDN
b. VAN
c. SDN
14. A __________ network is a privately owned packet switched network whose services
are sold to the public.
a. SDN
b. VAN
c. PDN